Edwards E2M28 1Ph 100/200–230 V 50 Hz, 100–120/200–240 V 60 Hz, IEC appliance connector C20 (for mains cable with C19), factory-set to 230 V

Edwards E2M28 – two-stage rotary vane vacuum pump

The E2M28 belongs to Edwards' EM series of small oil-sealed rotary vane pumps. It delivers 27.5 m³/h at 50 Hz and 33 m³/h at 60 Hz and reaches an ultimate pressure of 2 × 10⁻³ mbar without gas ballast, 0.03 mbar with gas ballast. The motor power is 0.75 kW at 50 Hz and 0.9 kW at 60 Hz (single-phase and three-phase). The sound pressure level is 57 dB(A); with the optional acoustic enclosure it drops to around 50 dB(A). The pump weighs approx. 44 kg and measures 611 × 160 × 264 mm (single-phase) or 626 × 160 × 264 mm (three-phase).

Design and equipment

• Gas ballast valve for pumping vapours (water vapour tolerance 50 mbar)
• Suction connection NW25, outlet with 15 mm hose nozzle
• Simple installation without customer wiring on the versions with appliance connector
• Approvals to EN 61010, CSA C22.2, UL 61010; pumping chamber rated to ATEX II 3 G Ex h IIB T4 Gc
• RoHS-compliant

Typical applications

For the EM pumps Edwards names scientific and laboratory applications and use as a backing pump for turbomolecular pumps; the pumps have also proven themselves in industrial applications.

Versions of the Edwards E2M28

The E2M28 is available in 7 versions (part numbers A37317984, A37333940, A37333934, A37315904, A37325984, A37343940, A37343934). The three-phase and the Japanese 100/200 V versions are hard-wired; the versions with IEC appliance connector need a mains cable ordered separately. FX versions are prepared for PFPE oil; the PFPE oil is ordered separately. The market details (Europe/USA, Asia, Japan) come from the Edwards ordering documents.

Advice and service

Ehrler & Beck supports you in selecting the right pump and version, supplies oil, accessories and spare parts and carries out maintenance and repair.

Pumping speed 50Hz	27.5
Pumping speed 60Hz	33
Ultimate pressure	2 × 10-3
Rated motor power 50Hz	0.75
Rated motor power 60Hz	0.9
Motor efficiency class	IE2
Weight	44
Length	61.1
Width	16
Height	26.4
Inlet connection flange	DN 25 ISO-KF (NW25)
Outlet connection flange	Hose nozzle 15 mm
Noise level	57 dB(A)
Cooling method	Air cooling
Oil type	Ultragrade 19, XTRAGRADE ADVANCED PFPE 64

Additional technical data